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Fix buffer overflow when saving compressed DDS images (#9041)

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Co-authored-by: Eric Soroos <eric-github@soroos.net>
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Andrew Murray 2025-06-28 00:29:58 +10:00 committed by GitHub
parent e783aff688
commit ef98b3510e
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2 changed files with 21 additions and 0 deletions
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17
Tests/test_file_dds.py
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@ -511,3 +511,20 @@ def test_save_dx10_bc5(tmp_path: Path) -> None:
im = hopper("L")
with pytest.raises(OSError, match="only RGB mode can be written as BC5"):
im.save(out, pixel_format="BC5")
@pytest.mark.parametrize(
"pixel_format, mode",
(
("DXT1", "RGBA"),
("DXT3", "RGBA"),
("DXT5", "RGBA"),
("BC2", "RGBA"),
("BC3", "RGBA"),
("BC5", "RGB"),
),
)
def test_save_large_file(tmp_path: Path, pixel_format: str, mode: str) -> None:
im = hopper(mode).resize((440, 440))
# should not error in valgrind
im.save(tmp_path / "img.dds", pixel_format=pixel_format)

4
src/libImaging/BcnEncode.c
View File

@ -258,6 +258,10 @@ ImagingBcnEncode(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
UINT8 *dst = buf;
for (;;) {
// Loop writes a max of 16 bytes per iteration
if (dst + 16 >= bytes + buf) {
break;
}
if (n == 5) {
encode_bc3_alpha(im, state, dst, 0);
dst += 8;